CompileRenderStringAsync have inconsistent problem with the model.

[0nary]

Describe the bug
When I run tests in a github workflow using CompileRenderStringAsync , I get this error in 2.3.0 : RazorLight.Compilation.TemplateCompilationException : Failed to compile generated Razor template:
Or this one in 2.0.0-rc.3 : System.NullReferenceException : Object reference not set to an instance of an object.

To Reproduce
You can find it in my repos : https://github.com/0nary/RazorLightTemplateRendererTesty

Expected behavior
I expected the method CompileRenderStringAsync to work consitently.

Additional context
The same tests work fine when I run it on my visual studio.

[jzabroski]

I still owe you a response.